The Magpul Armorer’s Wrench – AR15/M4 is an American-made, extremely durable, solid steel tool that’s comfortable to grip. Made in America using solid heat-treated steel with grip-enhancing manganese phosphate finish, this tool is built to last, and is perfect for home building your rifles, carbines, and pistols.
Engages both stock and pin-style barrel nuts, fits standard sized flash hiders, and installs and removes rifle receiver extensions and carbine castle nuts, with extended teeth for use with ASAP® plates. This comprehensive tool consolidates multiple functions into one compact package—including the USGI barrel nut wrench, free-float tube barrel nut wrench, 1/2″ torque wrench/breaker bar interface, armorer’s hammer with two hammer faces, rifle-length/entry-length receiver extension wrench, 3/4″ wrench for most flash hiders/muzzle brakes, USGI castle nut wrench usable with aftermarket end plates such as the ASAP® and ASAP®-QD, and a convenient bottle opener.
The Magpul Armorer’s Wrench works with a 1/2″ torque wrench, and relevant torque specifications are included on the tool for quick reference. Weighing 1.1 lb with a maximum length of 11.7 in and handle thickness of 0.35 in, this black steel wrench delivers professional-grade performance in a compact, versatile design ideal for AR-15/M4 platform maintenance and assembly.




